TwoOperandCmd.java

package com.github.HarryHook.coding2017.jvm.cmd;

import com.github.HarryHook.coding2017.jvm.clz.ClassFile;
import com.github.HarryHook.coding2017.jvm.constant.ClassInfo;
import com.github.HarryHook.coding2017.jvm.constant.ConstantInfo;
import com.github.HarryHook.coding2017.jvm.constant.ConstantPool;
import com.github.HarryHook.coding2017.jvm.constant.FieldRefInfo;
import com.github.HarryHook.coding2017.jvm.constant.MethodRefInfo;

public abstract class TwoOperandCmd extends ByteCodeCommand {

    int oprand1 = -1;
    int oprand2 = -1;

    public int getOprand1() {
	return oprand1;
    }

    public void setOprand1(int oprand1) {
	this.oprand1 = oprand1;
    }

    public void setOprand2(int oprand2) {
	this.oprand2 = oprand2;
    }

    public int getOprand2() {
	return oprand2;
    }

    public TwoOperandCmd(ClassFile clzFile, String opCode) {
	super(clzFile, opCode);
    }

    public int getIndex() {
	int oprand1 = this.getOprand1();
	int oprand2 = this.getOprand2();
	int index = oprand1 << 8 | oprand2;
	return index;
    }

    protected String getOperandAsClassInfo() {
	int index = getIndex();
	String codeTxt = getReadableCodeText();
	ClassInfo info = (ClassInfo) getConstantInfo(index);
	return this.getOffset() + ":" + this.getOpCode() + " " + codeTxt + "  " + info.getClassName();
    }

    protected String getOperandAsMethod() {
	int index = getIndex();
	String codeTxt = getReadableCodeText();
	ConstantInfo constInfo = this.getConstantInfo(index);
	MethodRefInfo info = (MethodRefInfo) this.getConstantInfo(index);
	return this.getOffset() + ":" + this.getOpCode() + " " + codeTxt + "  " + info.toString();
    }

    protected String getOperandAsField() {
	int index = getIndex();

	String codeTxt = getReadableCodeText();
	FieldRefInfo info = (FieldRefInfo) this.getConstantInfo(index);
	return this.getOffset() + ":" + this.getOpCode() + " " + codeTxt + "  " + info.toString();
    }

    public int getLength() {
	return 3;
    }
}